Nortel Networks NN43001-121 - Manual (Page 153)

Telephony Gateway and Services configuration 153
ATTENTION
When any kind of in-band signaling is to be used as payload audio packets (for
example, DTMF tones) in the egress direction (IP to TDM), the Signal Limiter
functionality must be disabled. If problems are encountered with DTMF tones
from Office Communicator contact Nortel support to ensure the Signal Limiter
functionality is disabled.
Dialing Plan configuration to route to MCM
In order for calls to be extended using PCA to the Office Communications
Server, a dialing plan entry must be entered on the Call Server to send the
call to the SIP trunk. This dialing plan entry does not correspond with any
number that is dialable within a network, but rather is used to route the call to
the MCM. The MCM service running on the OCS Proxy server handles the
incoming call and directs the call to the correct Office Communicator client.
The reason for this is that the SIP Invite generated by PCA has two fields:
• To: this field is used for the sole purpose of routing the invite to MCM.
• Original Called Number (OCN): this field is used to determine the
original number called. The OCN maps to stored information on the
Active Directory and sends the call to the correct Office Communicator
client.
For example, the CS 1000 network can be configured as shown in Figure 53
"Dialing plan to route to MCM" (page 153) .
Figure 53
Dialing plan to route to MCM
Nortel Communication Server 1000
Nortel Converged Office Fundamentals — Microsoft Office Communications Server 2007
NN43001-121 01.03 Standard
Release 5.0 30 April 2008
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